It may be strange but in engineering we use phasors or rotating vectors of 2 dimensions.
This is because we have resistance which is a real number and reactance which is an imaginary number (see previous posts). They have a phase difference of 90 degrees. Resistance dissipates energy, inductance or capacitance stores and releases energy.
No 3rd dimension?
Does nature only have energy dissipation, energy storage or release for passive systems?
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